中文乱码解决办法
cmd下中文不能输入
将cmd代码页改成936：
ruby 读取中文强制设置为utf-8
可以在文件中加一个注释语句 # encoding: UTF-8，ruby就会用utf-8格式载入
cmd输出乱码
这个解决不掉， 我看到有人用了一个第三方库来解决输出
require 'iconv'
cov = Iconv.new( 'gbk', 'utf-8')
puts cov.iconv("北京奥运会!")
PS: Ruby程序中，最好不要出现中文，注释除外
解决ruby不支持openssl的问题
在RHEL 5.4 x86_64安装rails的时候，提示ruby不支持openssl
进入$RUBY_HOME/ext/openssl目录， 执行 ruby exconf.rb，出现如下错误：
=== OpenSSL for Ruby configurator ===
=== Checking for system dependent stuff... ===
checking for t_open() in -lnsl... no
checking for socket() in -lsocket... no
checking for assert.h... yes
=== Checking for required stuff... ===
checking for openssl/ssl.h... no
=== Checking for required stuff failed. ===
Makefile wasn't created. Fix the errors above.
提示没有找到ssl.h, 从http://www.openssl.org/ 下载了openssl-0.9.8k.tar.gz。 解压，执行configure make make install. 回到$RUBY_HOME/ext/openssl重新执行
ruby extconf.rb --with-openssl-include=/usr/local/ssl/include/ --with-openssl-lib=/usr/local/ssl/lib
成功。但接下来执行make时 又出现新的错误：
~/sources/ruby-1.8.7-p174/ext/openssl$ sudo make
gcc -shared -o openssl.so ossl_x509.o ossl_x509cert.o ossl_x509crl.o ossl_pkcs7.o ossl_cipher.o ossl_pkey_dh.o ossl_ssl_session.o ossl_x509attr.o ossl_x509ext.o ossl_ocsp.o ossl_asn1.o ossl_x509name.o ossl_x509revoked.o ossl_rand.o ossl_pkcs12.o ossl_x509store.o ossl_ssl.o ossl.o ossl_digest.o ossl_config.o ossl_pkcs5.o ossl_bio.o ossl_pkey_dsa.o ossl_pkey.o ossl_x509req.o ossl_pkey_ec.o ossl_hmac.o openssl_missing.o ossl_ns_spki.o ossl_pkey_rsa.o ossl_engine.o ossl_bn.o -L. -L/usr/local/ruby/lib -Wl,-R/usr/local/ruby/lib -L/usr/local/ssl/lib -Wl,-R/usr/local/ssl/lib -L. -rdynamic -Wl,-export-dynamic -lssl -lcrypto -lrt -ldl -lcrypt -lm -lc
/usr/bin/ld: /usr/local/ssl/lib/libssl.a(s2_meth.o): relocation R_X86_64_32 against `a local symbol'
can not be used when making a shared object; recompile with -fPIC
/usr/local/ssl/lib/libssl.a: could not read symbols: Bad value
collect2: ld returned 1 exit status
make: *** [openssl.so] Error 1
提示重新试过编译openssl时带上-fPIC参数 。于是重新编译openssl
